Injector apparatus for case hardening retorts



Aug; 13, 1935. P. c. OSTERMAN V INJECTOR APPARATUS FOR CASE HARDENING RETORTS Filed Jan. 5, 1931 INVENTOR Philip C. Ostermn BY ATTORNEY Patented Aug. 13, 1935 r I p v UNITED STATES PATENT OFFICE INJECTOR APPARATUS For. oAsE HARDENING RETORTS Philip 0. Osterman, Elizabeth, N. J. Application January 5, 1931, Serial No. 506,605 1 Claim. (01. 266-5) This invention is an improvement upon my in- The numeral l indicates a fragment of the right vention described in my United States patent aphand end of a conventional rotary case hardening plication for Carburizing apparatus and method, or carburizing furnace provided with a gas inlet Serial No. 473,179, filed August 5, 1930. pipe 2 and a union 3 at the right hand end of My invention pertains particularly to the methpipe 2. 5 d of using available instrumentalities in an im- In the indicated position, union 3 attaches a proved arrangement, to accurately proportion the Venturi injector tube 4 to pipe 2. At the right quantities of carburizing gas and air or other hand end of tube 4 a depending flexible hose 5 is diluents which are to be introduced into the reshown, and gas may be drawn into the retort 6 of 1 tort of a case hardening or carburizing furnace furnace I by the injector which comprises tube 4 10 for the purpose of effecting the carburizing of the and a nozzle 1, best shown in Fig. 3. work contained therein. A source of gas is indicated as flowing from a A broad object of my invention is to provide an service main 9, through a valve H, a flow meter improved apparatus and an improved method of IS, a check valve [5, and into the hose 5 previously 1 using same, capable of highly eincient and acmentioned. curate control of the proportions and the mixture Referring to the right of Fig. 1, a blower I1 is a of the gas and diluent and to accomplish this indicated as forcing air through a pipe l9, avalve' efficiently'with apparatus of low first cost and in- 2!, a pipe 23, a flow meter 25, a pipe 21, a check expensive in operation. valve 29, a pipe 3|, an elbow 32, a depending flex- Another object of my invention is to provide an iblehose 33, an elbow 35, and a nipple 31, into 20 improved apparatus and method for this work, the nozzle 7. which is particularly designed to operate efiec- It may be observed that the blower I! is of a tively in conjunction with gas under very slight conventional centrifugal type, capable of creatpressure, of the order of a fraction of an ounce ing only a small air pressure, usually less than a per square inch, and air under low pressure, such half pound per square inch. This tym of blower 5 as can conveniently be created by'a conventional is inexpensive in first cost and is trouble free in blower fan or the like. operation as compared with blowers designed to Another object is to provide a special form of create higher pressures. Venturi injector for such apparatus wherein the However, such low pressures will not entrain cross section of the jet nozzle opening is large gas successfully without a special nozzle, such as 30 in comparison with conventional injectors, the jet nozzle i, being provided. Nozzle I has an orifice nozzle opening being preferably half the diameter 39, which has a bore not less than half the diamor more than half the diameter of the throat of eter of the bore of the throat 4| of tube 4. the Venturi tube. I claim:

Another object is to provide an improved ar- The combination in an injector apparatus'for 35 rangement of flexible hose for both the gas and introducing treating gas into heat treating reair whereby the mixture of gas and air may be torts, of a source of gas, insufficient in pressure created in as close proximity as possible to the to effectively mix with a diluent, such as air, and mouth of the retort. inject the mixture into the retort, of a compressor 40 Other objects will appear from the detailed for the diluent, a Venturi injector provided with 40 description of a preferred construction which folan injector nozzle connected to the compressor, lows, and be pointed out in the appended claim. said injector also being connected to the gas source Referring to the accompanying drawing whereby the gas may be entrained and mixed with Fig. l is a side elevation partly in section of a the diluent in suitable proportions and injected typical apparatus in which my method may be into a retort, means to regulate the quantity of 4.5

practiced. the mix and meter means connected to both the Fig. 2 is an enlarged fragment of the appagas and the diluent whereby the character and ra f Showing One Of the l w meters quantity of the mix may be at all times observed partly in section; and, as it flows. 5 Fig. 3 is an enlarged view of the injector from PHILIP c, OSTERMAN;

which the proportions of this part of the apparatus may be readily understood. 

